21054077 has 4 divisors (see below), whose sum is σ = 22968096. Its totient is φ = 19140060.

The previous prime is 21054067. The next prime is 21054119. The reversal of 21054077 is 77045012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21054077 - 2²⁰ = 20005501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21054017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 956993 + ... + 957014.

It is an arithmetic number, because the mean of its divisors is an integer number (5742024).

Almost surely, 2^21054077 is an apocalyptic number.

It is an amenable number.

21054077 is a deficient number, since it is larger than the sum of its proper divisors (1914019).

21054077 is a wasteful number, since it uses less digits than its factorization.

21054077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1914018.

The product of its (nonzero) digits is 1960, while the sum is 26.

The square root of 21054077 is about 4588.4721858152. The cubic root of 21054077 is about 276.1290310704.

Adding to 21054077 its reverse (77045012), we get a palindrome (98099089).

The spelling of 21054077 in words is "twenty-one million, fifty-four thousand, seventy-seven".